New Suzuki 150 challenges

brucehawsker · 25 July 2018, 06:18

First time out and comparing her, inevitably, to my late lamented Opti of the same power....

Two challenges -

A) I can't read the gauge in the sunlight on my console. Any suggestions as to how to increase brightness, contrast? No comparison to the Smart Gauges when i could see revs clearly

b) more seriously, she seems to be settling in the water deeper than she did. And even fully trimmed in she is chucking up a lot of water. Nonetheless she seems very nippy and very fast at given revs - although I have not yet run her at full throttle. Is this a problem with height of the engine, or do I need to add weight in the bow locker, change prop, or what?

Any ideas as always greatly appreciated.

Thx

Bruce

Maximus · 25 July 2018, 09:02

No need to Panic.
Defiantly sounds like an engine height/rigging adjustment needs to be made....water just on or lapping a bit over the Cav Plate at rest,whith level trim is a good place to start.
Ive had simillar issues in the past when re-powering but it's soon sorted

Nos4r2 · 25 July 2018, 10:28

Quote:

Originally Posted by Maximus

water just on or lapping a bit over the Cav Plate at rest

If your motor is that high up your impeller isn't even in the water.

I assume you mean the second plate, not the anti cav plate immediately above the prop?

beamishken · 25 July 2018, 10:41

Its irrelevant where the engine sits at rest its the relationship of the cav plate to the keel line that matters
Id probably start 1" up from level and keep moving up till I got best performance without excessive ventilation in turns or lumpy conditions
The spray usualy comes from the water hitting somewhere it shouldnt

Nos4r2 · 25 July 2018, 10:55

Quote:

Originally Posted by beamishken

Its irrelevant where the engine sits at rest its the relationship of the cav plate to the keel line that matters
Id probably start 1" up from level and keep moving up till I got best performance without excessive ventilation in turns or lumpy conditions
The spray usualy comes from the water hitting somewhere it shouldnt

Should point out that I know this.I was just making the point that the clamp shouldn't be levitating 2 feet above the transom

Maximus · 25 July 2018, 12:51

Quote:

Originally Posted by Nos4r2

If your motor is that high up your impeller isn't even in the water.

I assume you mean the second plate, not the anti cav plate immediately above the prop?

.....Maybe I shouldn't presume too much on here eh!

As I said it's a good starting point.

brucehawsker · 25 July 2018, 13:59

Thanks for advice. Assume I know nothing; it's always the safest bet. This rigging business seems an art form not a science! Any more advice?

If I raise the engine I am going to have to raise the A frame... the new engine hood is much higher than the Opti one and I can't fully raise the engine already without it hitting the A frame.

I suppose powered trim tabs might be a solution....

charliee · 25 July 2018, 14:26

maybe a photo of the engine trimmed down so you can see the cav plate in relation to the keel - as beamishken suggested

beamishken · 25 July 2018, 16:37

Quote:

Originally Posted by brucehawsker

Thanks for advice. Assume I know nothing; it's always the safest bet. This rigging business seems an art form not a science! Any more advice?

If I raise the engine I am going to have to raise the A frame... the new engine hood is much higher than the Opti one and I can't fully raise the engine already without it hitting the A frame.

I suppose powered trim tabs might be a solution....

By the time you buy and fit trim tabs youd be better off altering the A frame and setting up the engine properly.
The engine height at rest tells you nothing it could be several inches different depending on the hull shape.
Get a straight edge along the bottom of the keel and with the engine plumbed level the cav plate should be level or slightly above the keel. I usualy start about an inch up from level and then move up till im happy
Check that the trim limit pin isnt right in allowing you to trim too far in causing the engine to run deeper than desired

Xk59D · 25 July 2018, 17:18

if you are spraying a lot of water then chances are you need to go up with the engine.

modifying the A frame won't be a big deal if you have a competent welding shop local

most people suggest suzuki like to run deep due to the big props they use, i found when i bought my RIB it had a bad port list underway due to being too deep so i went up 1 which puts my engine about 1" above the V and it is happy there, it will only blow out if you are fully trimmed up and go hard over, a compromise i'm happy to live with.

need to check the can plate when underway, no other way to do it really.

brucehawsker · 25 July 2018, 22:55

Here are some before and after pictures

brucehawsker · 25 July 2018, 22:56

close-up at prop level.

What do people think???

Xk59D · 25 July 2018, 23:06

Too low by 1 or 2 holes I would suggest. You really need to get picture with cav plate level and take picture inline with the keel line. I'll see if I have a piccy of my df200....

Edit, is that definetely only a long shaft?

Looks different length than what you took off for sure looking at the mount.

Xk59D · 25 July 2018, 23:31

Old height, I went up a hole from this.

brucehawsker · 26 July 2018, 07:36

As requested. Fully trimmed in.

Pikey Dave · 26 July 2018, 08:30

Quote:

Originally Posted by brucehawsker

As requested. Fully trimmed in.

You need a photo with the AV plate inline with the keel. Put a straight edge along the keel projecting out past the bottom of the transom. Trim the engine so the AV plate is parallel to the straight edge. The plate should be about an inch above the top of the straight edge. That's your starting point.

brucehawsker · 26 July 2018, 10:02

Too many plates.

I assume the cab plate is the one immediately above the prop? If I have the engine vertical and run a line from the top of that plate it instersects with the transom at just about the lowest point of the v on the transom. Or the extreme bottom of the V

brucehawsker · 26 July 2018, 10:04

Basically NOT an inch above

Xk59D · 26 July 2018, 11:06

Engine is too low, it looks like you had a "standard" shaft before and this is a long?

beamishken · 26 July 2018, 11:23

Quote:

Originally Posted by Xk59D

Engine is too low, it looks like you had a "standard" shaft before and this is a long?

Dont think youll get a short (standard shaft) 150 opti
Looks like suzuki long shaft is slightly longer than the "normal" longshaft
Needs to go up the transom but looks like you wont manage that without re drilling holes
Pikey dave has given the best explanation of where to start